Engine



Feb. 27, 1940. l c. F. BCHLE ENGINES Filed sept. 26, 19:58

particularly. to the cylinder rocker box-cover assembly especially Yadapted box cover is constructed yand `arranged for cooperative assemblywith a cylinder head strucl rture in such away as to house the valveactuating r 'Patented Feb. 27,` 1940.

" I Carl F.. Bachle, Grosse PointavMi'ch., oasvsignor, by V mesneassignments,to Reconstruction lFinance Corporation, Detroit, Mich.;A aicorporationof `f the'v United StatesA l n i.Appliauonseptember2e,.1938,serisiNo. 231,711 y.

' 4c1aim s. (ci. 12s- 90) `This invention relates `to enginesl and morefor a radial air cooled aircraftengine.A` Y -More particularly, thepresent.' tains to a novel assembly in `which the rocker mechanism,particularly the rocker arm,y and .to

insure proper assembly at all times by limiting the axial displacementof the rocker' arm shaft.

j The present invention provides Ifor an improved construction in'whichready access may tion chamber be 'had to the valve operating mechanism,particularly the valvelrocker arm, and furthermore, provides averycompact assembly. p

For a more detailed description of the present invention reference maybe had to the accompanying drawing illustrating a preferred embodimentof the invention, and in which:

` Fig. l is a fragmentaryvertical' sectional'view of an engineillustrating the present invention,

Fig. 2 is a fragmentary vertical sectional view taken substantially onthe line 2-52 of Fig.

Fig. 3. is a plan sectional view taken substantially on the line 3`3 ofvFig. 2. j

For purposes of illustration, the present invention is shovvn'I inconjunction with an engine of the radial air cooled vtypeywhich isusually provided with` a plurality'o'f' radially `extending cylindersvl0. havingcooling ns II.A A piston l2'is "operable in said cylinder andcooperates :with the structure` AI,3 to define a'combus- I4..4 Thecylinder head structure is provided with the standard valve guides forcylinder head supporting the intakeV and exhaust valves I5 'and o isfurther provided with an extension I6 forming I forl lugs or supportsthe lower base portion ofthe rocker'box, Which vextension also supportsthe usual push rods I'l.l

The present vinvention pertains particularly to the construction ofAhousing the valve operating mechanism.

'Thev cylinder head IB which are provided with axially aligned drilledholes I9 l'for Supporting la 'rocker arm shaft `20. The rocker armsfZIare Apreferably mountedbetween the supports I8 and arepivotallysupported on v,said rocker armshaft 20. Said yrocker arm shaft 20ispreferably con#- structed of-f such a length as to arrange the endsthereof substantially flush with the'outer faces 22 of the rocker armsupports I8' and said .rocker arm" shaft or pin 20 is preferablyarranged to head and associated f ciated with the cylindervsubstantially circular inplan as shown in Fig. nventon per cylinderhead extension yflattened portions 25 bosses Z6 `which project f thecover and are preferably the rocker box and the covery extension |16 isprovided with l jecting outwardly beyond haves snug at within chemineeholes Ie or said rocker arm supports:18.1" A-jcover' 23 s-- asso- 3 andthe said cover'is. preferably secured tothe o bolts 2%. Y l. v l

"in orderto eliminateall chances of the rocker arm shaft or pin i9 frombeing displaced axiallyor beingv shifted an undue amount, the rocker'box cover 23 is substantially flattened as at at points substantially`diametrically opposite each other see Figs. 2 land 3).-` These of therocker box cover are provided with 'headextension and is by means` of aplurality y inwardly from the flattened side Wall portions of formedwith a het machined @face 21 vvhich is `positioned closely adjacent toshaft or pin I9. is provided a very tvveenthe ends of of' these bossesiipand It Will thus be noted that there minimum clearance A28 bethatvery little movement is permitted of the shaft or pin I9 relative to thesupports IS and thus it will be noted that at all times a maximum amountof bearing surface is maintained for lsupporting the shaft or pinv i9 insaid supports I8.

the end faces 'of the rocker arml the pin I9 and the faces 21'.'y

Thepresentconstruction permits for economical manufacture of these partssince it is possible' to very economically machine these partsvandrea'dily fit the same together when assem-g bling the engine.lFurthermore, 4the struction facilitates maintenance of the valveoperating mechanism since removal of -the cover assembly exposes thisWhole assembly and per'- mits readyjaccess to be had to said mechanism.y

It will be apparent to those skilled in the art to which this inventionpertainsthat various modifications and changes may be made thereinWithout departing from. the spirit of the inven-` tion or from the scopeof theiappended claims. I claim: j

, l 1. An 'engine structure having in combination,

means supported by said a cylinder head, valve cylinderfhead, valveactuating mechanism `including a valve actuating rocker arm, rocker armsupports carried by.; said cylinder head and prof the outer end of saidcylinder head,a `pin supported by said rocker `arm supports andpivotally supporting said'rocker arm, and a rocker box cover secured tosaid cylinder head and housing said rocker arm supports, said rockervbox cover having inwardly which substantially houses the entireroclierarm4 present conprojecting bosses axially aligned with said pin andpositioned closely adjacent to the end faces of said pin for limitingaxial movement of said pin.

2. Anengine structure having in combination, a cylinder head, valvemeans supported by said cylinder head, valve actuating mechanismincluding a valve actuating rocker arm, rocker arm supports carried bysaid cylinder head and projecting outwardly beyond theouter end of'saidcylinder` head, a pin supported' by said rocker arm supports andpivotally supporting said rocker arm, and al rocker box cover secured tosaid cylinder head and housing said rocker arm supports, said rocker boxcover Aconstructed substantially circular in plan and having inwardlypro- `iecting bosses axially aligned with said pin and positionedclosely adjacent to the end faces of s aid pin for limiting axialmovement of said pin.

3. An engine structure having4 in combination,

a cylinder head, valve means supported'by 'said` said rocker box cover,-constructed substantially circular in plan and having a pair of bossesprojecting inwardly vfrom substantially diametrically opposite portionsof the side Wallof said cover,

said bosses being axially alignedv with saidfpin and positioned closelyadjacent to the end faces of said d pin for limiting axial movement ofsaid pin. v i i i a cylinder head, valvemeans/supported by said 4. Anengine'structureihaving incor'nloination, I

. 10" i cylinder head, valve actuating mechanisminclude inga valveactuating rocker armrocler arm supports carried by said cylinderfheadand projecting outwardly beyond the outer endof said cylinder head, apin-supported by said rocker arm supports and pivotally lsupporting saidyrocker arm, and a rocker box cover secured to' said cyly.inder head andhousing said rocker arm supports, y `said rockerv box cover constructed'substantially circular in plan and having a pair of bosses pro-3yjecting inwardlyrom substantial!yl 'fdiametri'cally opposite portionsofthefrockerfbox cover, `side'v an inner irat face,` d with 'said in`, the

Wall, said bosses each having substantially axially aligned faces yofsaid y,bosses being located` closely adjacent vto the vend faces` ofsaid pin. for' limiting d l axial movement of saidpin. l l CARL BACHLE.

